A temp agency or staffing company is very different from what marlinspiker is talking about. A PEO (or professional employer organization) lets you do the hiring and day to day management of your employees, while they handle payroll, workers comp, taxes, etc. They can also help you do interviews, give you training solutions, and provide employment law advice (like providing an employee handbook).
Here's a description from my local PEO's website:
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The PEO typically handles the administration side of employment; establishing and maintaining employee files, processing payroll, filing payroll taxes, developing employee handbooks, benefit administration, workers compensation management, compliance assistance and human resource support.
A PEO is NOT a temp firm, staffing agency, a simple payroll service or placement agency.
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Here is the link to the TCIA article.
And you can find a PEO that does business in your state
here.